Albert Barnes Commentary 2 Chronicles 32:4

"So there was gathered much people together, and they stopped all the fountains, and the brook that flowed through the midst of the land, saying, Why should the kings of Assyria come, and find much water?" — 2 Chronicles 32:4 (ASV)

The “brook” mentioned is likely not the Kidron, but the natural watercourse of the Gihon, which ran down the Tyropoeon valley (compare the note on 1 Kings 1:3).